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I think you should get to much into finding a new name. Sometimes a new name just comes out of coincedence. A friend of mine found a new name becaus he was on a searche for baby nuture. He browsed a random website and found a name while reading the product reviews. To mee it seem a bit odd but my friend was absolutly happy with it. So maybe you are able to find a proper name just by reading a lot in forums and websites.
Good luck for you
I think Sophie Elizabeth Diana is the better option.